Environmental Assessment - National Capital Planning Commission

Environmental Assessment
Exterior work would involve lighting, roadway improvements,
paved parking (46 parking spots) and driving areas, sidewalks,
stormwater management features, and landscaping.
The warehouse would be built adjacent to the administrative
facility. It would be approximately 23,000 square feet in size,
with an 18-foot overhead clearance and an open SCIF environment,
as required by NSMA’s operations. It would include three loading
docks. On average, three tractor trailers would access or leave
the facility every day to load or unload materials and
equipment.
Both the administrative building and the warehouse would
incorporate sustainable design features sufficient to obtain a
Leadership in Energy and Environmental Design (LEED) “Silver”
rating. In addition to the green roof already mentioned, such
features may include low water usage landscaping, room occupancy
sensors, and use of regional recyclable and non-toxic
construction materials, among others.
Additional sustainability features would be incorporated in the
final design, consistent with the Navy’s requirement that Low
Impact Development (LID) techniques be used to meet the goal of
no net increase in stormwater volume and in sediment and
nutrient loadings for major renovation and construction
projects. LID must be used for all projects that will be under
construction in 2011. For projects scheduled to be under
construction prior to that date, the voluntary incorporation of
LID features consistent with the policy is strongly encouraged.
LID utilizes strategies that allow for the storage, filtration,
evaporation, and/or retention of runoff close to its source. For
instance, runoff from the new facility’s roof and new paved
areas would be collected and routed through on-site storm drains
and grass swales to a bio-retention/bio-filtration area where
the first half-inch of runoff would be retained and filtered
before being discharged to the existing storm drainage system.
Per the Energy Independence and Security Act of 2007, Section
438, “the sponsor of any development or redevelopment project
involving a Federal facility with a footprint that exceeds 5,000
square feet shall use site planning, design, construction, and
maintenance strategies for the property to maintain or restore,
to the maximum extent technically feasible, the predevelopment
hydrology of the property with regard to the temperature, rate,
volume, and duration of flow.” Navy guidance for the
implementation of this policy is under development. However, the
Alternatives 2-2